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Peanut Butter Cookie Bars with M&Ms

These easy and delicious peanut butter cookie bars with M&Ms are flaky and crispy on the top and chocolate and peanut filled on the inside.  Such a decadent treat.

Course bars
Prep Time 10 minutes
Cook Time 25 minutes
Total Time 35 minutes


  • 1 ¼ cups all-purpose flour
  • ½ tsp baking powder
  • ½ tsp kosher salt
  • ½ cup unsalted butter, softened
  • ½ cup granulated sugar
  • ½ cup light brown sugar
  • 1 cup creamy peanut butter
  • 1 large egg
  • 1 tsp vanilla
  • ¾ cup M&Ms


  1. Preheat oven to 350 degrees.  Lightly grease 8 inch square baking pan.

  2. Whisk flour, baking powder, and salt.  Set aside.

  3. In a stand mixer, on medium speed, beat butter, sugar, and brown sugar until light and fluffy.  Add peanut butter and mix well.  Mix in the egg and vanilla.

  4. Reduce mixer speed to low.  Add the flour mixture a little at a time, mixing until almost blended.  Stir in the M&Ms.

  5. Pour batter into prepared pan.  Bake 30-35 minutes, or until edges are lightly browned 

Recipe Notes

Adapted from Bake or Break